| abstract |
Provided is a method for extracting isosaponarin at a high concentration from wasabi (Wasabia japonica) leaves. Also provided is a method for extracting a material for foods, drugs and cosmetics. Isosaponarin is extracted at a high concentration from wasabi leaves, said wasabi leaves being restricted to wasabi leaves having a small leaf size of, for example, 3-14 cm in the maximum leaf width in the direction perpendicular to the leaf stem and also restricted to upland-cultivated wasabi leaves, with aqueous ethanol or 1,3-butylene glycol, thereby providing foods, drugs and cosmetics containing isosaponarin at a high concentration. |